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Composite sync
A synchronization signal made up of two components: one
horizontal and one vertical.
■
Contiguous memory
A block of memory occupying a single, consecutive series of
locations.
■
DCF
Digitizer Configuration Format.
A DCF
defines the input
data format and among other things, how to accept or
generate video timing signals such as horizontal sync,
vertical sync, and pixel clock.
■
Display memory
See
frame buffer
.
■
Exposure time
Refers to the period during which the image sensor of a
camera is exposed to light. As the length of this period
increases, so does the image brightness.
■
Field
One of the two halves that make up an image. One half
consists of the image's odd lines (known as the
odd field
); the
other half consists of the image's even lines (known as the
even field
).
■
Frame
A single image grabbed from a video camera.
■
Frame buffer
A frame buffer is a dedicated storage area often used for data
transfers between devices of differing speeds. For example,
since a computer sends out data faster than a screen can
display it, the data is temporarily stored in the frame buffer.
The buffer is generally thought of as a two-dimensional
surface with a certain pixel depth.
■
Grab
To acquire an image from a camera.
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